China, four people in the plan to immigrate to Mars.

I'm thinking about a question. If humans immigrate to Mars on a large scale in the future, will Martians come back to attack the earth hundreds of years later?

I think this is entirely possible and logical.

Let's assume such a future: 100 years later, human rocket engine technology has reached a higher level, such as nuclear-powered rockets. The ability of human beings to transport materials between stars has been improved by two or three levels. At this time, we can consider large-scale Martian immigration.

At the same time, more powerful rocket power brings faster interstellar travel speed, and it may only take a few days to go to Mars. Moreover, there is no need to wait for the Mars window every few years. It's just a matter of more days and less days, which is acceptable.

In the first few years, tens of thousands of people and hundreds of thousands of tons of goods were transported every year, and then these people slowly built a base on Mars. Building a rocket launching base on Mars makes it possible to return to Earth from Mars. In this way, a two-way passage has been established between the earth and Mars. People who go to Mars don't have to be afraid to stay there all their lives and come back in a few years.

More important than transporting people in the past is transporting a large number of materials and equipment in the past. It will take ten or twenty years to set up a factory there, build dozens of factories, and then establish a small industrial system, from metal smelting and nuclear power plants to the production of weapons, clothes and ordinary industrial products, and even establish a small agricultural ecology. It will take decades for human society on Mars to gradually achieve self-sufficiency and get rid of its dependence on the earth.

Next, you can start a huge Mars transformation project. After all, Mars is a planet, with the highest temperature around 35 degrees during the day, but it will drop to minus 140 degrees at night, with an average temperature of minus 63 degrees. Moreover, the atmosphere of Mars is very thin, the atmospheric pressure is only 1% of that of the earth, and the thin atmospheric component is mainly carbon dioxide.

In a few hundred years, Mars may become a relatively livable planet, of course, far worse than the earth. There are tens of millions or even hundreds of millions of people living on Mars, which will form a huge society.

At the beginning, people on Mars will definitely be highly dependent on the Earth, and Martians will fully carry out the instructions of the Earth headquarters and complete the tasks assigned by their superiors. But when Mars forms a self-sufficient society composed of tens of millions of people, will it still obey the instructions of the earth?

I think, at this time, Martians will become more and more independent. It is only a matter of time before Martians become independent. There are several factors that affect the process of Martian independence:

First, with the rocket technology at that time, the capital and time cost of going back and forth between Mars and Earth.

The higher the cost, the stronger the tendency of separation between Martians and earthlings.

Just like a big country in central China, it is very difficult for a neighboring province to be independent, because the distance is close, and people and things on both sides are very close and inextricably linked. Moreover, if one side wants to split, the other side will definitely not. War is inevitable, it is convenient to deliver firepower at close range, and it is easy to suppress its independence tendency.

On the other hand, if it is a distant enclave. The lack of personnel exchanges between the two sides and the long distance make the cost of governance higher and higher. Just like Britain and America, they are separated by the Atlantic Ocean. Once the United States is full-fledged and wants independence, Britain has no choice. Similarly, facing Mars billions of kilometers away, there is a long distance between them. Without frequent exchanges of materials and personnel, Martians naturally tend to be independent when they can be self-sufficient.

Distance itself is relative. Compared with physical distance, time distance and cost distance have more important practical value. If it takes several months and hundreds of millions of dollars to get from the earth to Mars, it will become a natural barrier between the earth and Mars, and the independence tendency of Mars will be very strong. If it only takes a few days and the cost is controlled between tens of millions or even millions, the exchange of people and materials between the earth and Mars will be closer and the tendency of independence will be less.

Second, the process of self-sufficiency in Martian society.

If Martians can no longer be self-sufficient and need a steady stream of supplies and food from the earth to maintain the operation of Martian society, then the independence tendency of Mars will be suppressed. Because once the earth is cut off, the Martian society may fall apart in a few years.

Therefore, the self-operation of Mars society is the most critical point of its independence. Once self-functioning, it won't be long before Martians clamor for independence.

Third, the amount of wealth created by Martians.

The wealth of Mars comes from two aspects, one is the minerals on Mars, and the other is the production capacity of the industrial system established by Mars. If huge high-value minerals such as bricks, stones and gold are found on Mars, Martians who immigrated to the past will strongly demand independence and will not share this wealth with the earth. They will trade with the earth as an independent society and sell these high-value minerals to the people of the earth. A rich Martian may emigrate to the earth and enjoy his wealth.

Of course, if Mars is finally found to be barren, the Martian society depends on itself, and the level of social wealth is always lower than that of the earth, then the independence tendency of Mars is relatively low. Poor Martians will want to maintain their citizenship of the earth and let the earth continue to help Mars.

Fourth, national competition within the earth.

You know, the earth society itself is not monolithic, but is composed of nation-states. In the foreseeable future, it is unlikely that there will be an earth society. The earthlings who immigrated to Mars can be further divided into American Mars, China Mars, European Mars, Russian Mars, Japanese Mars, British Mars and Indian Mars. For these people, there is a dual relationship between their societies. One is all immigrants from Mars, and the other is immigrants from different countries.

Take Americans who immigrated to Mars as an example. Does he tend to identify with the Martian society or with the United States on earth? Suppose there is a contradiction or even a war between China and the United States on the earth, will China and Americans on Mars also go to war? Perhaps, in their view, there is no need to bring ethnic contradictions on earth to Mars.

A good neighbour is better than a brother in the next village. After one or two hundred years, people who immigrate to Mars will gradually forget their identity as Americans, China, Indians and Europeans, and more identify themselves as Martians.

Such a thing actually happened once on earth: after Columbus discovered America, the British, the French, the Germans and the Italians successively immigrated to America and established the United States. In a century or two, Germans who immigrate to the United States will no longer identify themselves as Germans, but as Americans. When there was a war between Germany and France in Europe, French and Germans who immigrated to the United States would not fight. They will only fight for America and take advantage of France and Germany at the same time. The same thing will happen again after human beings immigrated to Mars on a large scale.

Martians' attitude towards people on earth will also be influenced by the national pattern of the earth itself. If the earth becomes a unified society, there will be no America, China, Britain and India, but only one United States of the Earth. This powerful earth country will be a more powerful deterrent, so that Martians will not dare to be alone. If the human society on the earth is still a number of competing nation-States, and the contradictions are deep. If Martians want to gain independence, they will use the contradictions between different countries on earth to seek their own interests.

When the United States became independent, France, as far away as Europe, made a lot of efforts. The United States only uses the contradiction between Britain and France to realize its independent interests.

By the same token, if the nation-states on the earth fight to the death, Martians can watch the fire from the other side and reap the profits. When the earth is weak, they can improve their bargaining power and achieve independence.

I think if Mars builds a self-sufficient society, independence is a matter of time. At that time, the difference between Martians and earthlings will be greater than that between Americans and China. Even long-term reproductive isolation may make Martians and earthlings more and more different in biological structure. The body structure of organisms is to adapt to the environment, and different environments will affect the evolutionary direction of organisms. The environmental difference between Mars and the earth is so great that it will definitely affect the biological evolution of Martians. At that time, Martians and earthlings will look more and more different. Biological differences will definitely be greater than those of whites, yellow people and blacks. At that time, there may be racial discrimination between earthlings and Martians.

After thousands of years of apartheid, Martians will be basically equivalent to aliens for people on earth.

Finally, back to that question, will Martians who become aliens come back to attack the earth? After all, in the eyes of Martians, the earth is also a rare planet, and they also want to expand their living space.

What is certain is that Martians after aliens will definitely have the will to come back and occupy the earth, and this will only get stronger and stronger. They probably don't want to live with the earth people, but want to destroy the earth people and monopolize the earth.

The crux of the problem lies in whether Martians have the ability to defeat the earth people. What plays a decisive role is the speed of scientific and technological development.

Generally speaking, Martians can't compete with the earth. Mars is smaller, its environment is worse, and it can carry fewer people than the earth. The earth can feed 654.38+0 billion people, and Mars may only feed hundreds of millions or even tens of millions. From a biological point of view, the evolution of human IQ is actually not great. Now the intelligence level of human beings is not higher than that of the ancients thousands of years ago. Earthlings who immigrate to Mars are also unlikely to make rapid intellectual progress (excluding genetic modification).

In this case, the quantity largely determines the development speed. More people will produce more elites and promote the development of science and technology faster. Just like China with a population of over one billion, an island country with a population of only a few million is unlikely to compete. Scientific research and large-scale industry need a lot of population support.

But to rule out a situation, that is, Martians invest more in technology. If Martians desperately develop science and technology after the founding of the People's Republic of China and turn the whole society into a research and development machine, for example, 30% of the national economy will be invested in scientific and technological research and development. In the direction of nuclear fusion, genetic engineering, artificial intelligence, quantum computing, etc., the investment intensity is higher than that of the earth society, and Martians may walk in front of the earth people.

Another important variable is the communication between Mars and the Earth. If there are frequent exchanges, even if Martians take the lead in breaking through a certain technology, people on earth can quickly know and catch up. This was the case in the United States and the Soviet Union. If the Soviet Union develops satellites first, it will strongly stimulate the United States.

Is it possible that Mars is advancing by leaps and bounds, but people on earth are not enterprising? Suppose that the leading earthlings are addicted to the fantasy of going to China at first, and look down on Martians, and the wretched development of Martians, while paying attention to hidden strength while developing rapidly, may paralyze earthlings.

This happened in China during the Qing Dynasty. The British ambassador came to the Qing Dynasty to see Emperor Qianlong, and wanted to trade, bringing many scientific and technological inventions. At that time, it was the first industrial revolution in Britain, which developed very fast. If Emperor Qianlong had been modest and actively communicated with Britain, China would have boarded the train of the first industrial revolution. But Ganlong indulged in the dream of going to China, looked down on the British, and abruptly missed such an opportunity. Will the earth people repeat the mistakes of the Qing dynasty at that time? This is an unknown number.

Historical experience tells us that once the industrial revolution happens, the changes in productivity and military strength are very rapid. It is very easy for a country to basically realize industrialization in just a few decades, and then go back and attack those agricultural countries.

Is it possible for Martians to seize the time window of decades and take the lead in entering the next industrial revolution, such as taking the lead in dealing with controlled nuclear fusion, new materials and quantum computing? Then, the Martian society may make a leap in just a few decades. At the same time, its military capabilities may also achieve a leap. For example, after controlled nuclear fusion is done, it will generate a steady stream of energy, and high-energy laser weapons may be developed soon. By then, the earth's weapons will mainly be missiles and nuclear bombs, and laser weapons will be easy to fight missiles. The earth fleet sends thousands of missiles, and the laser anti-missile system of the Mars fleet is easily intercepted. On the contrary, in the face of laser weapons at the speed of light, the earth has no choice but to be abused.

On the other hand, Martians focus on genetic engineering and soon surpass humans in genetic technology. On the one hand, we can transform ourselves with the help of genetic technology, so that Martians can surpass human beings intellectually, and then the speed of scientific and technological development can surpass human beings; On the other hand, they may develop genetic weapons according to the characteristics of human genes. Putting genetic weapons on the earth is the most cost-effective way of war.

I think some of the risks assumed above are objective.

So becoming an interstellar species will certainly expand human civilization. But it's really hard to say how civilized it was at that time and how civilized the earth was.